Fatal error: Uncaught Error: Interface "Vonage\Client\Credentials\CredentialsInterface" not found in /home/sourceex/public_html/pm/vendor/vonage/client-core/src/Client/Credentials/AbstractCredentials.php:19 Stack trace: #0 {main} thrown in /home/sourceex/public_html/pm/vendor/vonage/client-core/src/Client/Credentials/AbstractCredentials.php on line 19